Manager: Redirect index.html to root to fix initialization issues by cyyoon0311 · Pull Request #33625 · storybookjs/storybook

cyyoon0311 · 2026-01-22T17:24:21Z

What I did

I updated the Core Manager entry point (renderStorybookUI) to detect if the user is accessing the application via /index.html. If detected, it immediately redirects the browser to the root path / (preserving query parameters and hash) before the React application mounts.

Why?

When accessing Storybook explicitly via http://localhost:6006/index.html (without query parameters), the following issues occurred:

Router Initialization Failure: The router logic in url.ts parsed index.html as part of the path, resulting in an undefined story path state. This prevented the "auto-select first story" feature from working.
Malformed Iframe URLs: The Manager calculated the Preview URL by appending iframe.html to the current pathname, resulting in invalid URLs like /index.htmliframe.html, causing 404 errors in the preview iframe.
Inconsistent Environment Behavior: While internal development (yarn storybook:ui) could be patched via user config, generated sandboxes (npm start) remained broken.

Attempting to fix this within url.ts state logic proved brittle due to build caching and complex state synchronization. A browser-level redirect at the entry point provides a robust, universal fix for all environments (Dev UI, Sandboxes, Production).

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

stories
unit tests
integration tests
end-to-end tests

Manual testing

Caution

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Run a sandbox: npm start (or yarn storybook:ui for local dev)
Open a browser (preferably Incognito to avoid cache).
Navigate manually to http://localhost:6006/index.html.
Verify: The browser automatically redirects to http://localhost:6006/.
Verify: The first story loads correctly without 404 errors in the network tab.

Documentation

Add or update documentation reflecting your changes
If you are deprecating/removing a feature, make sure to update
MIGRATION.MD

Checklist for Maintainers

When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in sandbox-templates.ts
Make sure this PR contains one of the labels below:
Available labels
- bug: Internal changes that fixes incorrect behavior.
- maintenance: User-facing maintenance tasks.
- dependencies: Upgrading (sometimes downgrading) dependencies.
- build: Internal-facing build tooling & test updates. Will not show up in release changelog.
- cleanup: Minor cleanup style change. Will not show up in release changelog.
- documentation: Documentation only changes. Will not show up in release changelog.
- feature request: Introducing a new feature.
- BREAKING CHANGE: Changes that break compatibility in some way with current major version.
- other: Changes that don't fit in the above categories.

coderabbitai · 2026-01-22T17:27:59Z

📝 Walkthrough

Walkthrough

The PR adds URL redirect handling to Storybook's manager by implementing a guard that detects URLs ending with index.html, removes the suffix while preserving search and hash parameters, and performs a location replacement. The logic is applied via addon registration in the Storybook configuration and an additional guard in the manager UI rendering function.

Changes

Cohort / File(s)	Summary
URL Redirect Configuration `code/.storybook/manager.tsx`	Replaced `addons.setConfig()` call with `addons.register('redirect-fix')` that checks if the current pathname ends with `index.html` and rewrites the URL to remove `index.html` before performing a `location.replace()`
Manager UI Redirect Guard `code/core/src/manager/index.tsx`	Added redirect guard logic at the start of `renderStorybookUI()` to detect and handle `index.html` URLs, rewriting the path and performing early return after redirect

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

✨ Finishing touches

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JeroenBakker · 2026-01-23T14:53:44Z

Removing index.html from the path can break storybook if it's being served from somewhere that only allows exact file matches.
For example, I also serve a static storybook build as a CI artifact, which needs the index.html filename to be present for it to work.

For what it's worth I think #33624 aims to solve the same issue in a more compatible way.

storybook-app-bot · 2026-01-26T14:28:14Z

Package Benchmarks

^{Commit: f6f5b1f, ran on 26 January 2026 at 14:28:12 UTC}

The following packages have significant changes to their size or dependencies:

`@storybook/addon-a11y`

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`@storybook/addon-docs`

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`@storybook/addon-links`

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`@storybook/addon-onboarding`

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`eslint-plugin-storybook`

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`@storybook/preset-server-webpack`

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`@storybook/svelte`

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ghengeveld · 2026-01-28T13:50:07Z

Thanks for making an attempt at fixing this! However, I don't think redirecting is the appropriate fix here, because not all environments will serve index.html when requesting /. Closing this because there's other PRs which fix this in a different way, and in fact should already be fixed with #33647.

[fix] redirect index.html to root to fix initialization issues

b8af470

Merge branch 'next' into cyyoon0311/33548-fix-index-html-redirect

f6f5b1f

valentinpalkovic assigned ghengeveld Jan 26, 2026

valentinpalkovic added bug ui ci:normal and removed bug labels Jan 26, 2026

valentinpalkovic changed the title ~~[fix] redirect index.html to root to fix initialization issues~~ Manager: Redirect index.html to root to fix initialization issues Jan 26, 2026

valentinpalkovic added the bug label Jan 26, 2026

ghengeveld closed this Jan 28, 2026

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Manager: Redirect index.html to root to fix initialization issues#33625

Manager: Redirect index.html to root to fix initialization issues#33625
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cyyoon0311 commented Jan 22, 2026 •

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cyyoon0311 commented Jan 22, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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What I did

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Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

Manual testing

Documentation

Checklist for Maintainers

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coderabbitai Bot commented Jan 22, 2026

Walkthrough

Changes

Estimated code review effort

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JeroenBakker commented Jan 23, 2026

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storybook-app-bot Bot commented Jan 26, 2026

Package Benchmarks

@storybook/addon-a11y

@storybook/addon-docs

@storybook/addon-links

@storybook/addon-onboarding

storybook-addon-pseudo-states

@storybook/addon-themes

@storybook/addon-vitest

@storybook/builder-vite

@storybook/builder-webpack5

storybook

@storybook/angular

@storybook/ember

@storybook/html-vite

@storybook/nextjs

@storybook/nextjs-vite

@storybook/preact-vite

@storybook/react-native-web-vite

@storybook/react-vite

@storybook/react-webpack5

@storybook/server-webpack5

@storybook/svelte-vite

@storybook/sveltekit

@storybook/vue3-vite

@storybook/web-components-vite

@storybook/cli

@storybook/codemod

@storybook/core-webpack

create-storybook

@storybook/csf-plugin

eslint-plugin-storybook

@storybook/react-dom-shim

@storybook/preset-create-react-app

@storybook/preset-react-webpack

@storybook/preset-server-webpack

@storybook/html

@storybook/preact

@storybook/react

@storybook/server

@storybook/svelte

@storybook/vue3

@storybook/web-components

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cyyoon0311 commented Jan 22, 2026 •

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`@storybook/addon-a11y`

`@storybook/addon-docs`

`@storybook/addon-links`

`@storybook/addon-onboarding`

`storybook-addon-pseudo-states`

`@storybook/addon-themes`

`@storybook/addon-vitest`

`@storybook/builder-vite`

`@storybook/builder-webpack5`

`storybook`

`@storybook/angular`

`@storybook/ember`

`@storybook/html-vite`

`@storybook/nextjs`

`@storybook/nextjs-vite`

`@storybook/preact-vite`

`@storybook/react-native-web-vite`

`@storybook/react-vite`

`@storybook/react-webpack5`

`@storybook/server-webpack5`

`@storybook/svelte-vite`

`@storybook/sveltekit`

`@storybook/vue3-vite`

`@storybook/web-components-vite`

`@storybook/cli`

`@storybook/codemod`

`@storybook/core-webpack`

`create-storybook`

`@storybook/csf-plugin`

`eslint-plugin-storybook`

`@storybook/react-dom-shim`

`@storybook/preset-create-react-app`

`@storybook/preset-react-webpack`

`@storybook/preset-server-webpack`

`@storybook/html`

`@storybook/preact`

`@storybook/react`

`@storybook/server`

`@storybook/svelte`

`@storybook/vue3`

`@storybook/web-components`